Laser-Rf double-resonance studies of the hyperfine structure of metastable atomic states of55Mn

The hyperfine structure (hfs) of the metastable atomic states 3d⁶4s⁶ D _{1/2, 3/2, 5/2, 7/2, 9/2} of⁵⁵Mn was measured using theABMR- LIRF method (atomicbeammagneticresonance, detected bylaserinducedresonancefluorescence). The hfs constantsA andB, corrected for second order hfs perturbations, could be derived from these measurements. The theoretical interpretation of these correctedA- andB-factors was performed in the intermediate coupling scheme taking into account the configurations 3d ⁵4s ², 3d ⁶4s and 3d ⁷. Examining the influence of the composition of the eigenvectors on the hfs parameters (leftlangle {r^{ - 3} } rightrangle ^{k_s k_l } ) it was found, that for the configuration 3d ⁶4s the two-body magnetic interaction should be considered in the calculation of the eigenvectors. Investigating second order electrostatic configuration interactions and relativistic effects and using calculated relativistic correction factors we obtained for the nuclear quadrupole moment of the nucleus⁵⁵Mn a value ofQ=0.33(1) barn, which is not perturbed by a shielding or antishielding Sternheimer factor. The following hfs constants have been obtained: $$begin{gathered} Aleft( {{1 mathord{left/ {vphantom {1 2}} right. kern-nulldelimiterspace} 2}} right) = 882.056left( {12} right)MHz hfill Aleft( {{3 mathord{left/ {vphantom {3 2}} right. kern-nulldelimiterspace} 2}} right) = 469.391left( 7 right)MHzBleft( {{3 mathord{left/ {vphantom {3 2}} right. kern-nulldelimiterspace} 2}} right) = - 65.091left( {50} right)MHz hfill Aleft( {{5 mathord{left/ {vphantom {5 2}} right. kern-nulldelimiterspace} 2}} right) = 436.715left( 3 right)MHzBleft( {{5 mathord{left/ {vphantom {5 2}} right. kern-nulldelimiterspace} 2}} right) = - 46.769left( {30} right)MHz hfill Aleft( {{7 mathord{left/ {vphantom {7 2}} right. kern-nulldelimiterspace} 2}} right) = 458.930left( 3 right)MHzBleft( {{7 mathord{left/ {vphantom {7 2}} right. kern-nulldelimiterspace} 2}} right) = 21.701left( {40} right)MHz hfill Aleft( {{9 mathord{left/ {vphantom {9 2}} right. kern-nulldelimiterspace} 2}} right) = 510.308left( 8 right)MHzBleft( {{9 mathord{left/ {vphantom {9 2}} right. kern-nulldelimiterspace} 2}} right) = 132.200left( {120} right)MHz hfill end{gathered} $$